文章标题

package com.ldu.reflect;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;

interface Subject {
String action();
}

class RealSubject implements Subject {

@Override
public String action() {
System.out.println("我是代理类！！！！！！！！！！！！");
return "代理类";
}
}

class AopTest{
public void a1(){
System.out.println("i am a1");
}
public void a2(){
System.out.println("i am a2");
}
}

class myInvocationHandler implements InvocationHandler {
Object obj;

public Object blind(Object obj) {
this.obj = obj;

// 返回一个代理类的对象（被代理类的类加载器，被代理类实现的接口，调用此方法的对象）
return Proxy.newProxyInstance(obj.getClass().getClassLoader(), obj
.getClass().getInterfaces(), this);
}

@Override
public Object invoke(Object proxy, Method method, Object[] args)
throws Throwable {
AopTest at=new AopTest();
at.a1();
Object resultValue = method.invoke(obj, args);
at.a2();
return resultValue;
}

}

public class TestDongTai {
public static void main(String[] args) {
RealSubject rs=new RealSubject();
//创建一个实现了InvocationHandler接口的类的对象
myInvocationHandler mih=new myInvocationHandler();
Object obj=mih.blind(rs);
Subject sub=(Subject)obj;
String str=sub.action();
System.out.println(str);
System.out.println("------------------------------");
String str1=rs.action();
System.out.println(str1);
}
}